Excelsior-knife.



UNITED STATES PATEN T OFFICE;

HARRY W. SELLE, OF CHICAGO, ILLINOIS.

EXCELSIOR-KNIFE.

. Application filed April 19,

To all whom itmag concern:

Be it known that I, HARRY IV. Sauna, a citizen of the United States. residing at Chicago, in the county of (look and State of Illinois. have invented a certain new and useful Improvement in Excelsior-Knives. of which the following is a full, clear. concise. and exact description. reference being bad to the accompanying drawings. forming a part of this specification.

My invention relates to an improved construction of excelsior knife. that is. a knife adapted to be mounted in a machine sub stantially constructed for the purpose, by which the knife may be moved relatively to a block of wood and longitudinally along its surface so as to repeatedly take from the block thin continuous shavings of small width. h'lachines for operating knives of this kind are well known in the art and form no part of the present invention. as a result of which they are not herein shown or described.

Among the objects of my invention are. to produce a knife of the character described in which the shavings or excelsior produced ably the cutting a view shall consist of narrow strips entirely di vided from each other and which shall be so formed that the excelsior as a whole will not be matted into undesirable chunks; a further object of my invention consists of constructing a knife of the kind described so that it will avoid side thrusts upon the knife and machine and accomplish its work with a minimum amount of power since prefer V edges of the knife are so conformed that each cutting edge shears the wood.

The several drawings illustrating my invention areas follows:

Figure]. shows one construction of my improved knife in bottom perspective illus tratingthe conformation of the grooves cutin the knife and their relation to the top portion thereof. Fig. 2 is a top view of the knife shown in Fig. 1. Fig. 3 shows the knife illustrated in Figs. 1 and 2 in position upon a block of wood being cut thereby. Fig. 4 is a cross-sectional view of the knife shown in Figs. 1. 2 and 3. Fig. 5 shows in similar to Fig. 4f a modified con-' struction of knife.

Similar numerals refer to "similar parts throughout the several views.

As shown 1n Figs. 1, 2, 3 and 4. the knife 1 consists of a piece of steel of the general s ecification of Letters Patent.

' of additional V Patented J uly 23, 1912.

1912. Serial No. 691,826.

conformation ordinarily employed in woodworking for removing shavings from blocks of wood, the end of the knife being beveled as shown at 2. The top face of the knife has milled therein a plurality of grooves so conformed and rality of tongues 3 between which are disposed grooves l, between which grooves and tongues are disposed upon either side thereshaped grooves 5 and 6 having opposite inclinations and so conformed that the wall of the grooves adjacent to one -of thetongues 3 is atsubstantially right angles to the face of the knife while the other wall serves to join the bottom of the tongue with the outer edge of the adjacenttually prevent the formation of ribbon? lt \\'Ill be noticed that the V shaped grooves 5 and form the side As a result of the construction described, the shearing cuts come upon the cutting edges framed by the grooves 5 and 6 in opposite directions. thus producing no resultant side thrust upon the knife 1 or the block upon which it is operating. The cutting edges 5 and G of the knife serve to throw the shavings formed by them away from the grooves 4 and toward the shavings formed by the tongues 3. which operation results in makii-ig a fluffy, spongy mass of shavings which is the condition desired. Flll'tllfil more. each cutting surface, it will be ob served, is separated from each adjacent cutting surface by a vertical wall which ctt'ectually separates the shavings into narrow strips and prevents the formation of strips having a width of more than one of the cutting edges 3, 4. 5 and. 6, or, as is known in the art ribbon. Vere the grooves 4 omitted. in many cases ribbon would be formed extending between adjacent ones of the tongues lwhich would seriously interfere'with the effectiveness of operation of the knife.

In Fig. 3, the knife position upon a block 7, the shavings turned up from the various cutting edges being indicated in this view. It will be observed that the shavings 3 and 4 formed by the cutting edges 3 and 4 respectively, curl up in line withthe motion of the knife somewhat in advance of the cutting edges while disposed as to leave a plu- 'alls of the tongues 3.

is shown in operatingthe shavings 5 and 6 are turned away from theshavings 4 and toward each other, as a result of which the shavings cannot Wind up together to produce a solid mass. In the modified construction of knifeshown in Fig. 5, the grooves 15 and 16 are similar to the grooves 5 and 6 in the construction of knife shown in Figs. 1, 2, 3 and 4. The modified construction differs from the construct-ion above described in that the tongues 13 are provided with inclined cutting edges which are oppositely inclined so that the shearing action resulting from these cutting edges is balanced, producing no resultant side thrust upon the machine; also the cutting edges of the grooves 14 are inclined in opposite directions so that shearing cuts are the result which balance each other, thus producing no resultant side thrust upon the knife and machine. The inclination of the cutting edges 13 and 14 in the modification shown in Fig. 5 is about one-half that of the cutting edges 15 and 16, as a result of which all of the advantages incident to the construction of knife shown in Figs. 1 to 4 inclusive, are retained with the additional advantage that all of the cuts are shearing cuts. Complete separation is effected between the different shavings formed by using grooves 14 between the tongues 13 and .having oppositely inclined shearing edges 15 and 16 between the tongues and the grooves.

From the above it will appear that my invention consists in arranging shearing surfaces in such a manner that alternate tongues and grooves are formed in the cutting blade which are joined by oppositely disposed inclined cutting surfaces. The alternation of the tongues and grooves positively separates the shavings to prevent the formation of ribbon, and the arrangement of shearing surfaces, whether upon all of the cutting edges or only upon the cutting edges of the V shaped grooves, materially reduces the amount of power required to drive the machine, and also prevents side thrust upon the moving parts.

What I claim is:

1.. An excelsior knife having a beveled cutting edge extending across one end and a plurality of alternating tongues and grooves having side walls substantially perpendicular to the face of the knife formed longitudinally in its face extending from the cutting edge, there being V shaped-grooves of opposite inclination between each of the first named grooves and the adjacent tongues, said V shaped grooves being bounded in part by the said walls of the tongues, the outer surface of the tongues and the bottom surface of the grooves being oblique relatively to the side wallsof the grooves and of alternating inclination to produce separate shearing cuts.

2. An excelsior knife having a beveled cutting edge extending across one end and a plurality of alternating tongues and grooves having side walls substantially perpendicular to the face of the knife formed longitudinally in its face extending from the cutting edge, there being V shaped grooves of opposite inclination between each of the first named grooves and the adJacent tongues, said V shaped grooves being bounded in part by the said walls of the tongues.

3. An excelsior knife having a beveled cutting edge extending across one end and a plurality of alternating tongues and grooves having side walls substantially perpendicular to the face of the knife formed longitudinally in its face extending from the cutting edge, there being V shaped grooves of opposite inclination between each of the first named grooves and the ad jacent tongues, said V shaped grooves being bounded in part by the said walls of the tongues, the outer face of the tongues being oblique relatively to their side walls and alternately inclined in opposite directions, and the bottoms of the grooves being oblique relatively to their side walls and alternately inclined in opposite directions so that the cutting edges of the tongues and grooves will produce balanced shearing actions.

In witness whereof, I hereunto subscribe my name this 8th day of April, A. D. 1912.

HARRY WV. SELLE.

Witnessest ALBERT G. BELL, ALBIN C. AHLBERG. 

